A glimpse of objectivity in bipartite systems for non-entangling pure dephasing evolutions

Abstract

We study separable system-environment evolutions of pure dephasing type in the context of objectivity and find that it can lead to the natural emergence of Spectrum Broadcast Structure (SBS) states at discrete instances of time. Contrary to the standard way of obtaining SBS states which requires entanglement with the observed environment, reaching such states here does not require decoherence (no unobserved environements are necessary). Yet the biggest difference is the basis with respect to which the SBS states are formed. Here it is not the pointer basis of the system given by the interaction with the environment, but an equal superposition basis of said pointer states. The price to pay is the momentary character of the formed SBS structures, hence the term "glimpse".

7 pages, no figures

References in corpus (7)

• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Optimized Dynamical Decoupling in a Model Quantum Memory
• Quantum Darwinism
• Introduction to decoherence theory
• Complete disentanglement by partial pure dephasing
• Decoherence without entanglement and Quantum Darwinism
• Equivalence of qubit-environment entanglement and discord generation via pure dephasing interactions and the consequences thereof

Cited by in corpus (8)

• Witnessing non-objectivity in the framework of strong quantum Darwinism
• Blurred quantum Darwinism across quantum reference frames
• The meaning of redundancy and consensus in quantum objectivity
• The importance of using the averaged mutual information when quantifying quantum objectivity
• Decoherence and information encoding in quantum reference frames
• Qubit-environment entanglement in time-dependent pure dephasing
• Non-perfect propagation of information to noisy environment with self-evolution
• Thermality versus objectivity: can they peacefully coexist?